Improvement in air-pumps



G. E. BARKER 8L S. F. MACK.

l Air-Pumps. l145,926.

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GEORGE BARKER AND STEPHEN F. MACK, OF VAVERLY, NEW YORK.

IMPRovEMENT 1N AIR-PUMPS.

Specification forming part ofLetters Patent No. 145,926, dated December30, 1873; application filed May 26, 1873.

To all whom t may concern:

Be it known that we, GEORGE E. BARKER and STEPHEN F. MACK, of Vaverly,in the county of Tioga and State of New York, have invented certainImprovements in Air-Pumps of Fire-Extinguishers, of which the followingis a specification:

Our invention relates to improvements in the air-pumps of that class offire-extinguishers in which a reservoir is employed to contain theliquid to be thrown upon a tire, the liquid being ejected from suolichamber, when required, by atmospheric pressure, through a pipe or tubeand nozzle, regulated by a cock orA tap and our invention consists inthe peculiar arrangement and construction of the hollow piston and partsconnected therewith, as hereinafter fully described.

In the drawing hereunto annexed, which forms part of this specification,A represents the liquid-chamber of a fire-extinguisher; E, a plug forcharging the same with liquid 5 C, a valve for indicating` the pressureof air therein;

. K,.the discharge-pipe, and k the nozzle thereof.

E represents our improved air-pump, the casing e of which is firmlyconnected at-E to the chamber A. The air-pump E is provided with apiston, F, which is formed at the upper end with a hollow conicalchamber, J, to the center of the upper part of the wall of which thepiston-rod fl is connected, the under side of this chamber J bei gformed by a flenge, f, cast in the same pige@ with the wall thereof, andwhich, on its under side, is provided with a cylindrical portion, jf,which is tapped to receive a nut, G, for retaining the leather packing gin position, and also a cap, H, in the center of which is formed a smalloutlet, h,

through which the lower portion of the shank I valve I and the sides ofthe chamber h. The upper portion of the valve-shank I is also formedsmaller in diameter than the passage t' above the valve-seat, (whichconnects the conical chamber J with the valve-chamber h,) to allow ofthe free passage of the air. j j are passages formed in the wall of theconical chamber J for the passage of air to the chamber J from the upperside of the piston F.

The operation of the pump is as follows: The piston F being raised fromthe position shown in the drawing by means of the handle f2 andpiston-rod f1, the air contained in the chamber E will be forced throughthe passages j into the chamber J 5 it then passes down the passage fanddepresses the valve I', it then enters the chamber h', and passes out bymeans of the opening h to the under side of the piston F. On thedirection'of motion of the piston F being reversed, the valve 1 isimmediately pressed against its seat, thereby shutting oft" allconnection between the upper and under sides of the piston F, and theair contained in the chamber E beneath the piston F is consequentlyforced through the stopcock e and pipe e into the interior of thechamber A, and so on continuously.

Having thus described our invention, we would have it understood that welay no claim to the indicator C, nor to the chamber A and partsconnected therewith; but

What we do claim, and' desire to secure by Letters Patent, is-

In combination with the chamber E, the hollow piston F, constructed witha chamber, J, passages j, passage t', valve I, shank I, valvechamber h',spring c', and cap H, all arranged, constructed, and operatingsubstantially as shown and described.

In testimony that we claim the above we have hereunto subscribed ournames in the presence of two witnesses.

GEORGE E. BAKKER.. 'STEPHEN F. MACK.

VVituesses STEPHEN H. DEXTER, J. NEWTON DEXTER.

